you can see the dash icons when a place is closed

This bug was fixed in the package unity - 3.8.4-0ubuntu1

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unity (3.8.4-0ubuntu1) natty; urgency=low

  * New upstream release.
    - [fglrx] compiz crashed with SIGSEGV in nux::IOpenGLSurface::UnlockRect()
      (LP: #685682)
    - SIGSEGV in g_atomic_int_get (LP: #688803)
    - unity-panel-service crashed with SIGSEGV in bamf_factory_view_for_path()
      (LP: #717684)
    - New window tracking system breaks in the case where windows try to
      restack relative to destroyed windows that were never mapped
      (LP: #723014)
    - Numpad 'Enter' doesn't work on highlighted items in dash, places-files and
      places-apps (LP: #741615)
    - compiz crashed with SIGSEGV in free() (LP: #738864)
    - compiz crashed with SIGSEGV in g_closure_invoke() (LP: #741674)
    - compiz crashed with SIGSEGV in CompWindow::id() (LP: #742028)
    - Windows that reparent away from the root before they are mapped can
      cause other windows to become invisible (and compiz to crash)
      (LP: #743011)
    - compiz crashed with SIGABRT in raise() (LP: #743414)
    - compiz crashed with SIGSEGV in g_object_get_qdata() (LP: #742905)
    - compiz crashed with SIGSEGV in g_closure_invoke() (LP: #748033)
    - compiz crashed with SIGSEGV in CompScreen::dpy() (LP: #751372)
    - compiz crashed with SIGABRT in __kernel_vsyscall() (LP: #744867)
    - unity-window-decorator crashed with SIGSEGV in gdk_window_get_events()
      (LP: #725284)
    - Missing icons in app launcher (LP: #728393)
    - Multiple quick clicks on launcher icon with multiple windows completely
      crashes Unity (LP: #731790)
    - Add a test case for invisible windows regressions (LP: #736876)
    - Re-sync with xquerytree to avoid stacking order issues (LP: #740465)
    - Wrong window moves (LP: #741656)
    - compiz crashed with SIGSEGV in g_cclosure_marshal_VOID__VOID()
      (LP: #742280)
    - panel superposition (LP: #742859)
    - unity-window-decorator doesn't start on secondary X session
      (LP: #730495)
    - Unity Launcher stops autohiding and is not responsive (LP: #744325)
    - dash categories dropdown menu leaves "ghost" on desktop (LP: #746800)
    - new dialogs open close enough of the launcher to make hide (LP: #747302)
    - dnd from the application place to the launcher works only once
      (LP: #747316)
    - compiz crashed with SIGSEGV in CompWindow::id() while opening tcl/tk
      interface of R (LP: #747439)
    - minimize animates window fading to the top left corner (ubuntu symbol)
      (LP: #747765)
    - Spread - Clicking on a app icon to spread the windows must always show
      all the windows, regardless of whether or not some of the windows are
      minimised (LP: #750349)
    - Launcher - Show visual de-coupling of Launcher app icons (LP: #751196)
    - unity-window-decorator crashed with SIGSEGV in event_filter_func()
      (LP: #748317)
    - Pressing Super-W to switch windows also presents Dash (LP: #753453)
    - Don't create windows over the launcher (LP: #688816)
    - Unity Grid is broken for multi-monitor setups (LP: #709221)
    - F10 key does not move focus to indicators when on the desktop.
      (LP: #727548)
    - dynamic ...

it's still happening when close the places using esc on the keyboard